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Old 04-04-2013, 07:09 PM   #1
72BlckButy
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'69 Manual Master Cylinder (Disc/Drum) Bore Size

What would the correct bore size be for a 1969 pickup with a manual disc/drum setup?

Also, what master cylinder would you recommend for this setup? The individual is looking to cleanup under the good and would like a proportioning valve mounted up under the master cylinder.
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1969 CST SWB - Project Blank Slate (4.5/6" ECE Static Drop, 6-lug disc brake upgrade (manual), Billet Specialties Vintec 20x8.5 255/40 (F) 20x10 295/40 (R), 250 I-6)
1960 AMF Skylark - Tot Roddin' (Lowered with custom frame; soon to include custom push bar and interior)
2008 Silverado CrewCab 1LT (5.3L, 3:73, 4x4, LT1, Z-71, Towing Package)
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Old 04-04-2013, 07:40 PM   #2
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Re: '69 Manual Master Cylinder (Disc/Drum) Bore Size

I believe it's 1" bore iirc.
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1969 CST SWB - Project Blank Slate (4.5/6" ECE Static Drop, 6-lug disc brake upgrade (manual), Billet Specialties Vintec 20x8.5 255/40 (F) 20x10 295/40 (R), 250 I-6)
1960 AMF Skylark - Tot Roddin' (Lowered with custom frame; soon to include custom push bar and interior)
2008 Silverado CrewCab 1LT (5.3L, 3:73, 4x4, LT1, Z-71, Towing Package)
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Old 04-04-2013, 09:41 PM   #3
lolife99
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Re: '69 Manual Master Cylinder (Disc/Drum) Bore Size

1" is what I would use.
Aluminum only!
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Old 04-04-2013, 11:16 PM   #4
ulakovic22
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Re: '69 Manual Master Cylinder (Disc/Drum) Bore Size

Based on what I have researched, these trucks only came with 1 1/8 bore for manual and power disk/drum. Most people, myself included use a Corvette master, which is a 1" bore. POL has an aluminum Corvette MC and the prop valve can be mounted under the MC or to the side like factory.
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Old 04-05-2013, 05:24 AM   #5
72BlckButy
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Re: '69 Manual Master Cylinder (Disc/Drum) Bore Size

Thanks for the info.

He just located the CPP version with the built in proportioning valve. So we'll see where we end up.
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1969 CST SWB - Project Blank Slate (4.5/6" ECE Static Drop, 6-lug disc brake upgrade (manual), Billet Specialties Vintec 20x8.5 255/40 (F) 20x10 295/40 (R), 250 I-6)
1960 AMF Skylark - Tot Roddin' (Lowered with custom frame; soon to include custom push bar and interior)
2008 Silverado CrewCab 1LT (5.3L, 3:73, 4x4, LT1, Z-71, Towing Package)
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